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Rotation Rate of Active Nests on the Sun

Published online by Cambridge University Press:  12 April 2016

Lidia Van Driel-Gesztelyi ,
ED B.J. Van Der Zalm  and
Cornelis Zwaan
Lidia Van Driel-Gesztelyi
Affiliation:
Astronomical Institute, University of Utrecht, Postbus 80.000, 3508 TA Utrecht, The Netherlands Kiso Observatory, Institute of Astronomy, University of Tokyo, Mitake-mura, Kiso-gun, Nagano-ken, 397-01Japan
ED B.J. Van Der Zalm
Affiliation:
Astronomical Institute, University of Utrecht, Postbus 80.000, 3508 TA Utrecht, The Netherlands
Cornelis Zwaan
Affiliation:
Astronomical Institute, University of Utrecht, Postbus 80.000, 3508 TA Utrecht, The Netherlands

Abstract

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We analyse Greenwich sunpot group position data for one solar cycle (1952-1963) in order to study the rotation rate of clusters of sunspot groups, so-called active nests. We find that the latitude-dependent rotation rate of nests shows an intrinsic spread. This spread appears to be caused by extensive and dense clusters of sunspot nests (superclusters or nested nests), and by very compact single nests of short duration. The ‘best’ rotation rate is defined as the rate at which the highest number of sunspot groups appear to form nests. This latitude-dependent best rotation is close to the rotation rate of individual recurrent sunspots, although nests seem to rotate slightly more rigidly than sunspot groups.

Type
Session 8. Structure and Role of Emerging Flux Regions
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 504 - 506
Copyright
Copyright © Astronomical Society of the Pacific 1993

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